Best Time to Catch Mahi-Mahi Out of Myrtle Beach
Myrtle Beach's Offshore Mahi-Mahi Window
Myrtle Beach sits roughly 60 miles southwest of the Gulf Stream's closest approach to the South Carolina coast, putting blue water within reach of a half-day run during the warmer months. From late May through September, water temperatures along the Stream's western edge push into the upper 70s, drawing baitfish schools and the pelagic predators that follow them. Mahi-mahi fishing out of Myrtle Beach peaks during this window, and timing your trip correctly can mean the difference between a cooler full of dolphin and a long ride home.
May & June: The Early Push
The first mahi of the season typically show up along floating sargassum lines 45 to 55 miles offshore. These early-season fish tend to run on the smaller side — schoolies in the 5- to 12-pound class — but they travel in dense packs. Captains running out of Little River Inlet and Murrells Inlet start scanning SST charts for 74-degree breaks, and once those lines form consistently, the bite turns on fast. Trolling small ballyhoo on 30-pound spin tackle produces steady action, and light-tackle anglers can have days with 20 or more fish per boat.
July & August: Peak Season
Midsummer is prime time. Water temps climb above 78 degrees along the Stream edge, and the weedlines consolidate into well-defined highways of floating sargassum. Larger bulls — 20 to 40 pounds — mix in with the schoolies, especially around debris, lobster trap buoys, and current rips. The key is covering water until you find the right color break. Once you spot birds working over a patch of weeds, slow down and pitch live baits or chunk cut bonito to draw fish out from underneath.
Most Myrtle Beach captains agree: the single best week for mahi is usually the second or third week of July, when Gulf Stream eddies push warm water closer to shore and concentrate bait along defined temperature boundaries.
September: Late-Season Opportunity
By September, tropical weather systems can scatter weedlines or push them further offshore, but they also stir up nutrients that attract bait. Post-storm windows often produce some of the best mahi fishing of the entire year. Fish are fattened up and aggressive, and there is noticeably less boat pressure compared to the summer peak.
Tackle & Tactics Overview
| Month | Avg Fish Size | Best Technique | Typical Distance Offshore |
|---|---|---|---|
| May | 5–10 lb | Trolling small ballyhoo | 50–60 mi |
| June | 8–15 lb | Trolling & pitching live bait | 45–55 mi |
| July | 12–30 lb | Chunk & pitch at weedlines | 40–55 mi |
| August | 10–25 lb | Trolling skirted ballyhoo | 45–60 mi |
| September | 15–35 lb | Live bait at debris | 50–65 mi |
What to Bring
- Spinning gear: 20- to 30-pound braid on a 4000-series reel handles schoolies perfectly and makes every fish a blast
- Conventional trolling rods: 30- to 50-pound class for pulling skirted ballyhoo spreads
- Gaffs and dehookers: Mahi are fast and erratic at boatside, so a quality flying gaff saves time and fish
- Sun protection: Offshore runs mean 8+ hours in open water with no shade — plan accordingly
Combining Species on the Same Trip
One of the advantages of running offshore from Myrtle Beach is the chance to mix in other pelagic species on the same trip. Wahoo lurk along the same temperature breaks, especially in the 100-fathom zone, and king mackerel stack up on nearshore reefs and wrecks during the transit out and back. Many captains will slow-troll live baits along artificial reef sites on the way home, picking up kings and the occasional cobia to round out the catch.
Regulations and Limits
South Carolina follows federal Atlantic regulations for mahi-mahi: 10 fish per person per day with no minimum size. That said, responsible captains practice selective harvest and release smaller fish to keep the population healthy. Always check the latest rules on the SCDNR website before heading out, as regulations can change mid-season.
Booking Your Trip
Full-day offshore charters (10–12 hours) are the standard for mahi trips out of Myrtle Beach. Half-day boats rarely run far enough to reach productive water. Expect to depart between 5:30 and 6:00 AM from Little River Inlet or Murrells Inlet, with return times around 4:00 to 5:00 PM. Fuel surcharges are common during peak summer months given the long runs involved.